Solid

Yo where did you learn how to do them?

Taking classes from a Sifu in a local park, plus self-taught. Unlike how movies portray it, the one inch punch honestly is not anything of supernatural matter, and it's certainly not the most powerful of punches. The drill mainly serves as an excercise for generating explosive power and making you use your core more than your arms, which is where a lot of force comes from.

Yo that's super awesome, I don't know of too many sifu's where I am. I get what you mean by using your core though, I practice Taijiquan. While it isn't explosive, force comes from the legs, is mastered by the waist, and then expressed through the hands like a whip.